Cannons are basically weapons which launch a projectile with the help of gunpowder. However the first cannon known in history did not use gunpowder and was made by Ctesibius of Alexandria using compressed air. His work got destroyed in history and was later again discovered by Philo of Byzantium. Initially long pieces of paper and bamboo were used for barrels, later replaced by metals. The noted first use of gunpowder happened in the year 1132. […]